Chicago corn prices experienced a three-day consecutive increase, reaching a one-week high due to strong demand and higher prices in the physical market. Wheat prices, however, saw a two-day decline, though losses were limited by reduced prospects of increased exports from Ukraine. Spot basis bids for corn strengthened at Midwestern terminals, processors, and elevators. The wheat market had surged by over 5% on Monday in the wake of Russian attacks on Kyiv and the port of Mykolaiv, impacting Ukrainian grain exports. Despite challenges, Ukraine's grain, oilseed, and vegetable oil exports in May saw an 80% increase to 1.743 million tonnes compared to the previous month.